Most heroes don't have AI scripts associated with them at all, and thus, won't use their special abilities ever. I don't think Raynor even uses stim. That's why I think you have to have an arbiter.

Yeah nvm, computer players leave heroes totally unmanaged. There's a flag in units.dat that deprecates this, I just forgot about it.

They also always follow you when attacked, and won't move back to their original spot. They will, however, run away from un attackable units.

About P9.

For what can be used?

A neutral player, or an extra player if you have all 8 slots already being used for computers or humans, and you need some kind of neutral player, you then use player 9-12, I am currently using them in my map which has 8 slots filled to hold units temporarily for the players.

You can preplace units the extra units that cannot be created for those players and then give them to human players when needed, per example.
P9, P10 and P11 are hostile by default, but they lack fog of war buffers. So a buffer overflow will occour resulting in an undetermined fog of war layout for them. That means that most of their units will probably be 'blinded' and sometimes randomly attack.

Dont understand this.

P9 is hostile by default? He will always atack Humans Players?

I want to do the "transmision" effect to put circles in the floor, and i've thoug on P9 for burrow a defiler, for expample.

If I use P8 (cpu) the zerglings come out of borrowing and attack humans players.. >_<

P9-12 are not really players. They were probably once planned, then Blizzard decided to drop them. P9-11 isn't even used by Blizzard in any way. And P12 is only used for critters and leavers.

You cannot use these players normally, and yes, P9-11 are hostile by default. But it will not attack, but follow you around if you attack him.
You can only preplace units (e.g. the burrowed defiler) for these players or give it to them from other players in game.

I don't know which transmission effect will put circles in the floor. But you can simulate a heat wave effect by opening/closing disabled floor hatches for a player you don't have vision to.

I don't explain myself well...

I'm not sure if you can use player 9 units to send transmissions from. But if they don't unburrow (they shouldn't) you can test this easily by yourself.